Weather forecast for 10 daysCastro Valley, CA
Weather forecast for the weekend
Sunday Oct 18, 2026
- 70°F
- 54°F
Partly Cloudy
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 12mphW 262°
- Humidity: 70%
- UV index: 5
- Sunrise: 7:19 am PDT
- Sunset: 6:27 pm PDT
- details ▼
On Sunday, in Castro Valley, some passing clouds may drift through, but the sun will shine at times.
The temperature variation is anticipated to range from a maximum of an agreeable 69.8°F to a minimum of a crisp 53.6°F.
Today, the expected high will correspond with the regular October temperature of 72.5°F.
Sunrise will be at 7:19 am and sunset at 6:27 pm; the daylight will last for 11h and 7min.
The temperature variation is anticipated to range from a maximum of an agreeable 69.8°F to a minimum of a crisp 53.6°F.
Today, the expected high will correspond with the regular October temperature of 72.5°F.
Sunrise will be at 7:19 am and sunset at 6:27 pm; the daylight will last for 11h and 7min.
10-day overview
Daily temperatures
Maximum temperature: 70°C.
Coldest day: tomorrow 64°C.
Coldest day: tomorrow 64°C.
Chance of precipitation
Highest chance: Wednesday 59%.
Long-term weather forecast
- Sunday
- Oct 18, 2026
- 70°F
- 54°F
Partly Cloudy
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 12mphW 262°
- Humidity: 70%
- UV index: 5
- Sunrise: 7:19 am PDT
- Sunset: 6:27 pm PDT
- details ▼
- Monday
- Oct 19, 2026
- 64°F
- 52°F
Partly Cloudy
- Precip. probability: 12%
- Precipitation: 0"
- Wind: 13mphW 268°
- Humidity: 62%
- UV index: 5
- Sunrise: 7:20 am PDT
- Sunset: 6:25 pm PDT
- details ▼
- Tuesday
- Oct 20, 2026
- 70°F
- 54°F
Cloudy
- Precip. probability: 12%
- Precipitation: 0.12"
- Wind: 8mphW 274°
- Humidity: 62%
- UV index: 3
- Sunrise: 7:21 am PDT
- Sunset: 6:24 pm PDT
- details ▼
- Wednesday
- Oct 21, 2026
- 66°F
- 54°F
Showers
- Precip. probability: 59%
- Precipitation: 0.2"
- Wind: 7mphWSW 253°
- Humidity: 74%
- UV index: 2
- Sunrise: 7:22 am PDT
- Sunset: 6:23 pm PDT
- details ▼
- Thursday
- Oct 22, 2026
- 66°F
- 54°F
AM Showers
- Precip. probability: 36%
- Precipitation: 0.04"
- Wind: 11mphWSW 257°
- Humidity: 77%
- UV index: 4
- Sunrise: 7:23 am PDT
- Sunset: 6:21 pm PDT
- details ▼
- Friday
- Oct 23, 2026
- 70°F
- 50°F
Partly Cloudy
- Precip. probability: 12%
- Precipitation: 0"
- Wind: 9mphWNW 288°
- Humidity: 69%
- UV index: 5
- Sunrise: 7:24 am PDT
- Sunset: 6:20 pm PDT
- details ▼
- Saturday
- Oct 24, 2026
- 70°F
- 50°F
Partly Cloudy
- Precip. probability: 18%
- Precipitation: 0"
- Wind: 9mphW 265°
- Humidity: 60%
- UV index: 4
- Sunrise: 7:25 am PDT
- Sunset: 6:19 pm PDT
- details ▼
- Sunday
- Oct 25, 2026
- 68°F
- 50°F
Partly Cloudy
- Precip. probability: 24%
- Precipitation: 0"
- Wind: 11mphW 266°
- Humidity: 62%
- UV index: 4
- Sunrise: 7:26 am PDT
- Sunset: 6:17 pm PDT
- details ▼
- Monday
- Oct 26, 2026
- 68°F
- 48°F
Partly Cloudy
- Precip. probability: 16%
- Precipitation: 0"
- Wind: 10mphW 264°
- Humidity: 60%
- UV index: 4
- Sunrise: 7:27 am PDT
- Sunset: 6:16 pm PDT
- details ▼
- Tuesday
- Oct 27, 2026
- 68°F
- 48°F
Partly Cloudy
- Precip. probability: 10%
- Precipitation: 0"
- Wind: 9mphW 264°
- Humidity: 58%
- UV index: 4
- Sunrise: 7:28 am PDT
- Sunset: 6:15 pm PDT
- details ▼
Conditions over the next ten days suggest that primarily overcast and occasionally rainy weather is expected.
Rain is predicted for Tuesday through Thursday.
The maximum temperature will be almost identical over the next several days. Expected highs will hover between 64.4°F and 69.8°F, while the lowest nighttime temperatures will be also relatively consistent, as the minimum temperature will fluctuate between 48.2°F and 53.6°F.
With a maximum temperature of 69.8°F, Sunday, Tuesday, Friday and Saturday will be the warmest days; the lowest daytime temperature of the period will be reached on Monday, peaking at 64.4°F.
Rain is predicted for Tuesday through Thursday.
The maximum temperature will be almost identical over the next several days. Expected highs will hover between 64.4°F and 69.8°F, while the lowest nighttime temperatures will be also relatively consistent, as the minimum temperature will fluctuate between 48.2°F and 53.6°F.
With a maximum temperature of 69.8°F, Sunday, Tuesday, Friday and Saturday will be the warmest days; the lowest daytime temperature of the period will be reached on Monday, peaking at 64.4°F.
Updated: Oct 18, 2026 @ 10:25:05 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Frequently asked questions
Today, scattered clouds may briefly filter the sunlight, but it will remain bright overall.
Today, the highest temperature will be 69.8°F, while the lowest temperature will be 53.6°F.
The maximum temperature will be in line with the average highest temperature of 72.5°F in October. The lowest temperature today will be also in line with the average low temperature.
The maximum temperature will be in line with the average highest temperature of 72.5°F in October. The lowest temperature today will be also in line with the average low temperature.
On Sunday, in Castro Valley, sunrise will be at 7:19 am and sunset at 6:27 pm (PDT).
Today in Castro Valley, the daylight will last for 11h and 7min.
